Water
ICSE · Class 9 · Chemistry
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What is the molecular formula of water?
At what temperature does pure water boil under normal pressure?
What happens to the density of water at 4°C?
Water is called a universal solvent because:
Sample Questions
Which of the following are examples of hydrated substances?
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CuSO4·5H2O (Blue vitriol), Na2CO3·10H2O (Washing soda), MgSO4·7H2O (Epsom salt)
Hydrated substances contain water of crystallization. CuSO4·5H2O, Na2CO3·10H2O, and MgSO4·7H2O all contain water molecules. NaCl and KNO3 are anhydrous substances without water of crystallization.
Which of the following are characteristics of a true solution?
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It is homogeneous, It is clear and transparent, Solute particles are very small
A true solution is homogeneous, clear, transparent, and contains very small solute particles (about 10⁻¹⁰ m). It does not scatter light and cannot be separated by filtration.
What is efflorescence?
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Loss of water of crystallization on exposure to air
Efflorescence is the phenomenon where hydrated substances lose their water of crystallization when exposed to dry air, causing them to crumble into powder. Examples include washing soda and Glauber's salt.
Hard water contains dissolved salts of:
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Calcium, Magnesium
Hard water contains dissolved salts of calcium and magnesium, such as their bicarbonates, sulfates, or chlorides. Sodium and potassium salts do not cause water hardness.
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